GMAT Quantitative Reasoning Practice Test 4

Question : 78 of 100

Marks: +1, -0

Danny, Doris and Dolly flipped a coin 5 times and each time the coin landed on "heads". Dolly bet that on the sixth time the coin will land on "tails", what is the probability that she's right?

1
$1 \/ 2$
$3 \/ 4$
$1 \/ 4$
$1 \/ 3$

Validate

Solution:

The probability of the coin is independent on its previous outcomes and therefore the probability for "head" or "tail" is always

1 / 2

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